Formula: CuFe2(PO4)2(OH)2
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.843, β = 1.848, γ = 1.945
Bireflectance/Birefringence δ: 0.102
2V angle: 28° (calculated), 60-70° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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